A Framework for the Experimental Comparison of Solar and Skydome Illumination

作者：Kider Joseph T Jr^*; Knowlton Daniel; Newlin Jeremy; Li Yining Karl; Greenberg Donald P

来源：ACM Transactions on Graphics, 2014, 33(6): 180.

DOI：10.1145/2661229.2661259

• skylight models
• measurements
• validation
• spectral

The illumination and appearance of the solar/skydome is critical for many applications in computer graphics, computer vision, and day-lighting studies. Unfortunately, physically accurate measurements of this rapidly changing illumination source are difficult to achieve, but necessary for the development of accurate physically-based sky illumination models and comparison studies of existing simulation models.
To obtain baseline data of this time-dependent anisotropic light source, we design a novel acquisition setup to simultaneously measure the comprehensive illumination properties. Our hardware design simultaneously acquires its spectral, spatial, and temporal information of the skydome. To achieve this goal, we use a custom built spectral radiance measurement scanner to measure the directional spectral radiance, a pyranometer to measure the irradiance of the entire hemisphere, and a camera to capture high-dynamic range imagery of the sky. The combination of these computer-controlled measurement devices provides a fast way to acquire accurate physical measurements of the solar/skydome. We use the results of our measurements to evaluate many of the strengths and weaknesses of several sun-sky simulation models.

• 出版日期2014-11